Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 1: Opera mechanica

Table of Notes

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          <p>
            <s xml:id="echoid-s6007" xml:space="preserve">
              <pb o="278" file="0362" n="393" rhead="MACHINARUM"/>
            dum K, M, quæ ſit circitcr 27{1/2} pollicum , menſurando diſtan- tiam inter harum media. </s>
            <s xml:id="echoid-s6008" xml:space="preserve">Altitudo cujusvis pyxidis eſt præter-
              <lb/>
            propter unius pollicis cum ſemiſſe; </s>
            <s xml:id="echoid-s6009" xml:space="preserve">diameter interior unius polli-
              <lb/>
            cis vel 15 linearum; </s>
            <s xml:id="echoid-s6010" xml:space="preserve">diameter cavitatis reliqui tubi {1/10} vel {1/12} ejusdem
              <lb/>
            magnitudinis. </s>
            <s xml:id="echoid-s6011" xml:space="preserve">Primo infunditur ſolus Mercurius in tubum per
              <lb/>
            aperturam N, ut fiat barometrum vulgare ex iis quæ inferius re-
              <lb/>
            curvata ſunt. </s>
            <s xml:id="echoid-s6012" xml:space="preserve">Infundendum vel tollendum eſt Hydrargyrum
              <lb/>
            donec ſuperficies dentur circiter in medio pyxidum K & </s>
            <s xml:id="echoid-s6013" xml:space="preserve">M,
              <lb/>
            ſi tempore quo fit hæc operatio aër mediæ ſit gravitatis, id
              <lb/>
            eft in barometris vulgaribus Mercurius ſit ad altitudi-
              <lb/>
            nem 27{1/2} pollicum; </s>
            <s xml:id="echoid-s6014" xml:space="preserve">alioquin enim ſi preſſio aëris ſit major vel
              <lb/>
            minor ordinariâ, ad hocattendendum, computando pro uno
              <lb/>
            pollice variationis, in vulgari barometro, lineam unam cum
              <lb/>
            ſemiſſe variationis in quavis pyxide: </s>
            <s xml:id="echoid-s6015" xml:space="preserve">Poſtquam Mercurius
              <lb/>
            bene aëre depurgatus erit, ita ut nullus detur in pyxide K
              <lb/>
            infundetur per aperturam N quidam liquor, qui hieme non
              <lb/>
            congelatur, & </s>
            <s xml:id="echoid-s6016" xml:space="preserve">qui nequit diſſolvere Mercurium; </s>
            <s xml:id="echoid-s6017" xml:space="preserve">E. </s>
            <s xml:id="echoid-s6018" xml:space="preserve">G. </s>
            <s xml:id="echoid-s6019" xml:space="preserve">aqua
              <lb/>
            communis mixta cum {1/8} aquæ fortis: </s>
            <s xml:id="echoid-s6020" xml:space="preserve">ſpiritus vini quidem
              <lb/>
            poſſidet has duas qualitates, ſed non conveniret barometro,
              <lb/>
            quia per calorem dilatatur. </s>
            <s xml:id="echoid-s6021" xml:space="preserve">Hoc etiam referri debet ad pri-
              <lb/>
            mam formam Barometri.</s>
            <s xml:id="echoid-s6022" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6023" xml:space="preserve">Quod attinet ad liquoris quantitatem, debet illa adſcendere ad
              <lb/>
            pedem unum circiter in tubum B C poſitâ mediâ aëris preſſione.</s>
            <s xml:id="echoid-s6024" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6025" xml:space="preserve">Diſpoſito ita hoc Barometro videbimus, maximam diffe-
              <lb/>
            rentiam preſſionis aëris, quæ notabitur per ſuperficiem li-
              <lb/>
            quoris in tubo M N, fore propemodum 22 pollicum, ſi
              <lb/>
            diametri pyxidum cylindricarum, ſint decies majores diametro
              <lb/>
            tubi. </s>
            <s xml:id="echoid-s6026" xml:space="preserve">Et ut inveniamus quantum differentiæ quas indicatæ ba-
              <lb/>
            rometrum hoc noſtrum excedantillas, quas poteſt indicare ba-
              <lb/>
            rometrum vulgare, generalis eſt regula, differentias noſtrinovi
              <lb/>
            Barometri eſſe ad differentias Barometri vulgaris, ut decies & </s>
            <s xml:id="echoid-s6027" xml:space="preserve">
              <lb/>
            quater quadratum diametri pyxidum ad idem quadratum plus
              <lb/>
            vicies octies quadratum diametri tubi, qui aquam continet;
              <lb/>
            </s>
            <s xml:id="echoid-s6028" xml:space="preserve">& </s>
            <s xml:id="echoid-s6029" xml:space="preserve">hinc ſequitur, cujuſcunque magnitudinis ſint pyxides,
              <lb/>
            maximas differentias non poſſe excedere 28 pollices, quan-
              <lb/>
            doquidem differentiæ Barometrorum ordinariorum non ex-
              <lb/>
            cedunt duos pollices.</s>
            <s xml:id="echoid-s6030" xml:space="preserve"/>
          </p>
          <note symbol="*" position="foot" xml:space="preserve">Pollices hi ſunt partes duodecimæ pedis Regii Gallici.</note>
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